Mold for producing DVD magnetic heads

Abstract

The invention relates to a mold for producing DVD magnetic heads, which comprises a cross gate, wherein the corresponding products of the cross gate comprise a mold and a cavity; the tail end of the cross gate also comprises a cold charge storing part; and the length of the cross gate is 48mm-52mm, and the cross sectional area of the cross gate is 28mm<2>-32mm<2>. The invention has the advantagesthat by the actual verification of the product produced by a hot chamber die-casting machine, the size is quite stable, and the appearance reject ratio is less than 0.01%.

Description

technical field [0001] The invention relates to a mold, in particular to a mold for a DVD (Sharp LCHSZ0009PAZZ) magnetic head. Background technique [0002] Depend on figure 1 It can be seen that the DVD magnetic head is a key part of Sharp DVD, and it has been imported from abroad. The dimensional tolerance of the product is only ±0.03mm, which is difficult to control in actual production, and the defect rate of DVD performance is relatively high. [0003] Depend on figure 2 It can be seen that the sprue 201 of the Japanese mold is used in the prior art, the cross-sectional area of ​​the sprue is large, the distance between the sprue is long, the flow rate of the zinc liquid is slow, there are many flow marks and poor filling during production, and the casting rejection rate is relatively high. [0004] The main problems of such structural molds are as follows: [0005] 1. The product is relatively small, and the dimensional tolerance of the casting is between ±0.03mm....

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Problems solved by technology

[0005] 1. The product is relatively small, and the dimensional tolerance of the casting is between ±0.03mm. In order to ensure dimensional stability, the pressure of the machine cannot be increased, so the appearance is prone to flow marks and poor filling, and the casting scrap rate is relatively high. During the actual assembly process DVD performance defect rate is relatively high

[0006] 2. In the prior art, the runner 201 of the Japanese mold is used, the cross-sectional area of ​​the runner is large, the distance of the runner is long, the time for the zinc liquid to flow into the mold cavity is long, and the heat loss is large, because the cooling of the zinc liquid causes the hot chamber die-casting machine There are more losses in the process of pressure uploading, which eventually leads to more flow marks and poor filling; in addition, the product is made of one mold and two cavities (202, 203)

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